I'd say I primarily use a calendar for seeing which day of the week is which calendar date. I typically don't have too much scheduled in the next ~two weeks at any time to keep in my head, in the form of day of the week now that I think about it. I usually use a calendar to check if there's anything further out than that and convert it to e.g. 'next thursday' to remember.

It sounds like you use a calendar much more than I do, I check mine once every couple weeks at most tbh. I might be the outlier here though, who knows.